# Christian Stieber

> Christian Stieber is a angel investor backing Customer Service. See 1 investments, check sizes, portfolio and contact details. Updated Aug 2026.

- Type: Angel Investor
- Total investments: 1
- Lead investor: 0%
- Last updated: Aug 2026

Christian Stieber is a angel investor focused on Customer Service and Assistive Technology. Christian Stieber

## Contacts

5 contacts available for Christian Stieber: work email, personal email, work phone, personal phone and socials. Sign up free to unlock them: https://app.shizune.co/sign-up/investor-profiles/find-email/christian-stieber?utm_source=investor_profile

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Customer Service | 1 | 100% |
| Assistive Technology | 1 | 100% |
| Artificial Intelligence | 1 | 100% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| fonio.ai | Founded in Vienna in 2024, fonio.ai provides AI-powered phone assistants that automate customer communication 24/7. The platform answers calls, forwards inquiries, books appointments, and integrates with CRM and ERP systems, while every interaction is transcribed and can be stored, shared, or connected to existing tools. | $3.5M | Angel | Dec 02, 2025 | https://www.fonio.ai/ |

1 of 1 investments shown.

## Co-investors
- [another.vc](https://shizune.co/investors/profile/another-vc) — VC Fund, 1 deal together
- [Sequoia Scout](https://shizune.co/investors/profile/sequoia-scout) — VC Fund, 1 deal together

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## Featured in investor lists
- [Health Care Angel Investors in Austria](https://shizune.co/investors/health-care-angel-investors-austria)

## FAQ

### What does Christian Stieber invest in?

Christian Stieber invests primarily in Customer Service, Assistive Technology and Artificial Intelligence startups, most often at Angel stage. Most of the 1 investments tracked by Shizune back companies in Austria. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### How do I contact Christian Stieber?

For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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